Furnace for boilers



June Z 19 A. COTTON FURNACE FOR somms Filer; May 21, 1920 Patented June 2, 1925.

UNITED STATES. PATENT OFFICE;

ALFRED common, or STJ'LOUISQMISSGURI, ASSIG'EORQTO" HEINEBOILER COMPANY;

on sat LQUIS, MISSOURI, a oonronnrroit OF'ltII-SSOU-RI;

runnacn son norn'nns,

' Application. filed May 21,.

1 o all whom it may concern.-

Be it known that I, ALFRED COTTON, a citizen of the United States, residing at. St. Louis, Missouri, have invented a certain new and useful Improvement in Furnaces for Boilers, of which the following is a full, clear, and exact description, such as will enable others, skilled in the art to which it appertains to make and use the same.

This invention relates to furnaces for boilers, and particularly internal furnaces for boilers of the Scotch-marine type.

One object of my invention is to provide a furnace for boilers that is capable of successfully withstanding great external pres sure, and which can be produced easily by deforming a tubular member by a pressing operation.

Another object is to provide a furnace for boilers whose internal'surface is of such form that it tends to cause more eddies with better mixing of the gasesv and a greater tendency to break up the adherent gas film, thus producing better combustion and more effective transmission of heat.

Figure 1 of the drawings is a cross-sectional view of my improved furnace; and

Figure 2 is a vertical longitudinal sec-.- tional view of a boiler equipped with a furnace constructed in accordance with my in vention. V

As the furnace A of the boiler shown in Figure 2 is the only part of the boiler-which is novel, I will not refer to the other parts or elements of the boiler.

The internal furnaces that are extensively used in boilers of the Scotch mar'ine type comprise a tube generally of cylindrical form that is provided with circumferential corrugations, so as to permit the tube to be made of relatively thin metal but still have sufficient resistance-to external pressure to prevent it from collapsing. Such furnace tubes have to be made by a rollingoperation, and one of the main objects of my invention is to provide a reinforced furnace that can be produced easily by apressing operation.

To this end I have devised a'furnace which is formed from a tubular member, preferably of approximately cylindrical shape, that is provided with interrupted circumferential corrugations arranged so that the finished furnace is made up of a number in staggered relation. The furnace A is preferably made by taking a cylindrical member and forming circumferential rows of short buckles 1 in same by pressing or deforming said member. The buckles l are preferably of substantially diamond shape or of ellipsoidal form in outline and are arranged with the major axis of the ellipse extending circumferentially of the furnace and the minor axis extending longitudinally of thefurnace, each buckle being of angular shape in cross section, preferably V-shape,

shown in Figure 2. Inthe form of my of'substantially polygonal sections arranged of a number of sections, each of which con-i sists of a polygon that has rounded corners. Since the buckles 1 of the various sections or rows intermesh, no part of the furnace, with the exception of the extreme end portions, retains any cylindrical form, but, on the contrary, every part of the furnace forms someport-ion of the buckle.

A furnace of the construction above described is easier to manufacture than a furnace provided' with uniform corrugations extending circumferentially of the furnace, because it can be produced by a pressing instead of a rolling operation. Owing to. the

interdependence of the buckles 1, great strength is attained with less accuracy, and another desirable feature of such a furnace is that the irregular, broken up internal surface of same, caused by the-circumferential rows of staggered protuberances there on causes more, eddies, with better mixing of the gases and a greater tendency to break up the adherent gas film, thus producing better combustion, with more effective transmission of heat. The extreme end portions of the furnace A can either be flanged or left in their original cylindrical form so as to facilitate attaching the furnace to the co operating parts of the boiler.

Having thus described my invention, What I claim as new and desire to secure by Letters Patent, is: r

1. A furnace for boilers consisting of a tubular member provided With a plurality of parallel sections, each of which is composed of a circumferentialrow ofsubstantia-lly diamond-shaped buckles or pressed portions disposed With their major axes extending circumferentially of said member and their minor axes extending longitudinally of saidmember.

2. A furnace for boilers consisting of a tubular member provided with a plurality portions disposed with their major axes extending circumferentially of said member and their minor axes extending longitudinally of said member, the buckles of the respective sections being arranged in staggered relation.

- 'ALFRED COTT 

